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Fig. 8.2 shows the structure and bonding in silicon dioxide. The structure and bonding is similar to diamond. silicon atom oxygen atom Fig. 8.2 State the type of structure and bonding in silicon dioxide. Choose from the list. giant ionic giant covalent giant metallic simple covalent
See it on the paper →One of the forms of carbon in Fig. 5.2 is diamond. Explain why diamond is used in cutting tools.
See it on the paper →Carbon reacts with hydrogen to form methane, CH 4 . Complete the dot-and-cross diagram in Fig. 5.3 to show the bonding in methane. Only show the outer-shell electrons. H H C H H
See it on the paper →Fig. 8.1 shows two forms of the element carbon, diamond and graphite. diamond graphite Fig. 8.1 Put a tick (3) next to the correct description for the structure of diamond and graphite. giant covalent ionic polymer metallic
See it on the paper →At very high temperatures, oxygen reacts with silicon to form silicon( IV ) oxide (silicon dioxide), SiO 2 . Fig. 8.2 shows part of the structure of silicon dioxide. oxygen silicon Fig. 8.2 Describe the structure of silicon dioxide.
See it on the paper →Diamond is one form of carbon. Fig. 11.1 shows the arrangement of carbon atoms in diamond. Fig. 11.1 Circle two words from the list to describe the structure and bonding in diamond. simple giant metallic ionic covalent polymer
See it on the paper →forms diamond and graphite
See it on the paper →Silicon dioxide, SiO 2 , has a similar structure to diamond. Fig. 11.2 shows the structure of silicon dioxide. silicon atoms oxygen atoms Fig. 11.2 Describe the structure and bonding in silicon dioxide. Use Fig. 11.2 to help you.
See it on the paper →Graphite is used as a lubricant. Explain why. Use ideas about the structure and bonding in graphite.
See it on the paper →State one similarity between the structure of graphite and the structure of silicon( IV ) oxide.
See it on the paper →The use of the correct terminology was important as references to strength were rejected. Explanations in terms of structure were more successful with some candidates describing the tetrahedral structure of diamond.
— Examiner report, May/June 2025, 0654/42 Q5(d)(ii) (Cambridge)
The sharing of one pair of electrons between the carbon and hydrogens was generally shown correctly. Occasionally, candidates mistakenly added additional electrons to the hydrogen atoms.
— Examiner report, May/June 2025, 0654/42 Q5(e) (Cambridge)
Most candidates knew one of the words used to describe the structure and bonding in diamond – giant and covalent. Ionic and polymer were popular incorrect suggestions.
— Examiner report, October/November 2023, 0654/33 Q11(c) (Cambridge)
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